Adressing feedback

README.md

@@ -20,7 +20,7 @@ If bundler is not being used to manage dependencies, install the gem by executin
 
 ### Nixpkgs package
 
-It is also available as [nixpkgs](https://github.com/ceritium/flatito/issues/8) thanks to @Rucadi
+It is also available as [nixpkgs](https://search.nixos.org/packages?channel=unstable&show=flatito) thanks to [@Rucadi](https://github.com/Rucadi)
 
     $ nix run nixpkgs#flatito